[Ruby][client] Handle enums (and other scalars) in oneOf and anyOf schemas (#17515)

* Handle enums in oneOf and anyOf schemas

* Update specs

modules/openapi-generator/src/main/resources/ruby-client/partial_anyof_module.mustache

@@ -79,7 +79,7 @@
               return model if model
             else
               # raise if data contains keys that are not known to the model
-              raise unless (data.keys - const.acceptable_attributes).empty?
+              raise if const.respond_to?(:acceptable_attributes) && !(data.keys - const.acceptable_attributes).empty?
               model = const.build_from_hash(data)
               return model if model
             end

modules/openapi-generator/src/main/resources/ruby-client/partial_oneof_module.mustache

@@ -121,7 +121,7 @@
               return model if model
             else
               # raise if data contains keys that are not known to the model
-              raise unless (data.keys - const.acceptable_attributes).empty?
+              raise if const.respond_to?(:acceptable_attributes) && !(data.keys - const.acceptable_attributes).empty?
               model = const.build_from_hash(data)
               return model if model
             end

modules/openapi-generator/src/test/resources/3_0/ruby/petstore-with-fake-endpoints-models-for-testing.yaml

@@ -1313,7 +1313,7 @@ paths:
       operationId: getParameterNameMapping
       parameters:
         - name: _type
-          in: header 
+          in: header
           description: _type
           required: true
           schema:
@@ -1326,7 +1326,7 @@ paths:
           schema:
             type: string
         - name: type_
-          in: header 
+          in: header
           description: type_
           required: true
           schema:
@@ -2091,6 +2091,9 @@ components:
       oneOf:
         - $ref: '#/components/schemas/whale'
         - $ref: '#/components/schemas/zebra'
+    mamal_with_enum:
+      oneOf:
+        - $ref: '#/components/schemas/cow'
     mammal:
       oneOf:
         - $ref: '#/components/schemas/whale'
@@ -2122,9 +2125,14 @@ components:
       required:
         - classname
       additionalProperties: true
+    cow:
+      type: string
+      enum:
+        - BlackAndWhiteCow
+        - BrownCow
     PropertyNameMapping:
-      properties: 
+      properties:
-        http_debug_operation: 
+        http_debug_operation:
           type: string
         _type:
           type: string

samples/client/petstore/ruby-httpx/.openapi-generator/FILES

@@ -19,6 +19,7 @@ docs/Cat.md
 docs/Category.md
 docs/ClassModel.md
 docs/Client.md
+docs/Cow.md
 docs/DefaultApi.md
 docs/DeprecatedObject.md
 docs/Dog.md
@@ -36,6 +37,7 @@ docs/FormatTest.md
 docs/HasOnlyReadOnly.md
 docs/HealthCheckResult.md
 docs/List.md
+docs/MamalWithEnum.md
 docs/Mammal.md
 docs/MammalAnyof.md
 docs/MammalWithoutDiscriminator.md
@@ -91,6 +93,7 @@ lib/petstore/models/cat.rb
 lib/petstore/models/category.rb
 lib/petstore/models/class_model.rb
 lib/petstore/models/client.rb
+lib/petstore/models/cow.rb
 lib/petstore/models/deprecated_object.rb
 lib/petstore/models/dog.rb
 lib/petstore/models/enum_arrays.rb
@@ -105,6 +108,7 @@ lib/petstore/models/format_test.rb
 lib/petstore/models/has_only_read_only.rb
 lib/petstore/models/health_check_result.rb
 lib/petstore/models/list.rb
+lib/petstore/models/mamal_with_enum.rb
 lib/petstore/models/mammal.rb
 lib/petstore/models/mammal_anyof.rb
 lib/petstore/models/mammal_without_discriminator.rb
@@ -135,4 +139,6 @@ lib/petstore/models/whale.rb
 lib/petstore/models/zebra.rb
 lib/petstore/version.rb
 petstore.gemspec
+spec/models/cow_spec.rb
+spec/models/mamal_with_enum_spec.rb
 spec/spec_helper.rb

samples/client/petstore/ruby-httpx/README.md

@@ -136,6 +136,7 @@ Class | Method | HTTP request | Description
  - [Petstore::Category](docs/Category.md)
  - [Petstore::ClassModel](docs/ClassModel.md)
  - [Petstore::Client](docs/Client.md)
+ - [Petstore::Cow](docs/Cow.md)
  - [Petstore::DeprecatedObject](docs/DeprecatedObject.md)
  - [Petstore::Dog](docs/Dog.md)
  - [Petstore::EnumArrays](docs/EnumArrays.md)
@@ -150,6 +151,7 @@ Class | Method | HTTP request | Description
  - [Petstore::HasOnlyReadOnly](docs/HasOnlyReadOnly.md)
  - [Petstore::HealthCheckResult](docs/HealthCheckResult.md)
  - [Petstore::List](docs/List.md)
+ - [Petstore::MamalWithEnum](docs/MamalWithEnum.md)
  - [Petstore::Mammal](docs/Mammal.md)
  - [Petstore::MammalAnyof](docs/MammalAnyof.md)
  - [Petstore::MammalWithoutDiscriminator](docs/MammalWithoutDiscriminator.md)

samples/client/petstore/ruby-httpx/docs/Cow.md

@@ -0,0 +1,15 @@
+# Petstore::Cow
+
+## Properties
+
+| Name | Type | Description | Notes |
+| ---- | ---- | ----------- | ----- |
+
+## Example
+
+```ruby
+require 'petstore'
+
+instance = Petstore::Cow.new()
+```
+

samples/client/petstore/ruby-httpx/docs/MamalWithEnum.md

@@ -0,0 +1,47 @@
+# Petstore::MamalWithEnum
+
+## Class instance methods
+
+### `openapi_one_of`
+
+Returns the list of classes defined in oneOf.
+
+#### Example
+
+```ruby
+require 'petstore'
+
+Petstore::MamalWithEnum.openapi_one_of
+# =>
+# [
+#   :'Cow'
+# ]
+```
+
+### build
+
+Find the appropriate object from the `openapi_one_of` list and casts the data into it.
+
+#### Example
+
+```ruby
+require 'petstore'
+
+Petstore::MamalWithEnum.build(data)
+# => #<Cow:0x00007fdd4aab02a0>
+
+Petstore::MamalWithEnum.build(data_that_doesnt_match)
+# => nil
+```
+
+#### Parameters
+
+| Name | Type | Description |
+| ---- | ---- | ----------- |
+| **data** | **Mixed** | data to be matched against the list of oneOf items |
+
+#### Return type
+
+- `Cow`
+- `nil` (if no type matches)
+

samples/client/petstore/ruby-httpx/lib/petstore.rb

@@ -28,6 +28,7 @@ require 'petstore/models/capitalization'
 require 'petstore/models/category'
 require 'petstore/models/class_model'
 require 'petstore/models/client'
+require 'petstore/models/cow'
 require 'petstore/models/deprecated_object'
 require 'petstore/models/enum_arrays'
 require 'petstore/models/enum_class'
@@ -41,6 +42,7 @@ require 'petstore/models/format_test'
 require 'petstore/models/has_only_read_only'
 require 'petstore/models/health_check_result'
 require 'petstore/models/list'
+require 'petstore/models/mamal_with_enum'
 require 'petstore/models/mammal'
 require 'petstore/models/mammal_anyof'
 require 'petstore/models/mammal_without_discriminator'

samples/client/petstore/ruby-httpx/lib/petstore/models/cow.rb

@@ -0,0 +1,40 @@
+=begin
+#OpenAPI Petstore
+
+#This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\
+
+The version of the OpenAPI document: 1.0.0
+
+Generated by: https://openapi-generator.tech
+OpenAPI Generator version: 7.3.0-SNAPSHOT
+
+=end
+
+require 'date'
+require 'time'
+
+module Petstore
+  class Cow
+    BLACK_AND_WHITE_COW = "BlackAndWhiteCow".freeze
+    BROWN_COW = "BrownCow".freeze
+
+    def self.all_vars
+      @all_vars ||= [BLACK_AND_WHITE_COW, BROWN_COW].freeze
+    end
+
+    # Builds the enum from string
+    # @param [String] The enum value in the form of the string
+    # @return [String] The enum value
+    def self.build_from_hash(value)
+      new.build_from_hash(value)
+    end
+
+    # Builds the enum from string
+    # @param [String] The enum value in the form of the string
+    # @return [String] The enum value
+    def build_from_hash(value)
+      return value if Cow.all_vars.include?(value)
+      raise "Invalid ENUM value #{value} for class #Cow"
+    end
+  end
+end

samples/client/petstore/ruby-httpx/lib/petstore/models/mamal_with_enum.rb

@@ -0,0 +1,104 @@
+=begin
+#OpenAPI Petstore
+
+#This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\
+
+The version of the OpenAPI document: 1.0.0
+
+Generated by: https://openapi-generator.tech
+OpenAPI Generator version: 7.3.0-SNAPSHOT
+
+=end
+
+require 'date'
+require 'time'
+
+module Petstore
+  module MamalWithEnum
+    class << self
+      # List of class defined in oneOf (OpenAPI v3)
+      def openapi_one_of
+        [
+          :'Cow'
+        ]
+      end
+
+      # Builds the object
+      # @param [Mixed] Data to be matched against the list of oneOf items
+      # @return [Object] Returns the model or the data itself
+      def build(data)
+        # Go through the list of oneOf items and attempt to identify the appropriate one.
+        # Note:
+        # - We do not attempt to check whether exactly one item matches.
+        # - No advanced validation of types in some cases (e.g. "x: { type: string }" will happily match { x: 123 })
+        #   due to the way the deserialization is made in the base_object template (it just casts without verifying).
+        # - TODO: scalar values are de facto behaving as if they were nullable.
+        # - TODO: logging when debugging is set.
+        openapi_one_of.each do |klass|
+          begin
+            next if klass == :AnyType # "nullable: true"
+            typed_data = find_and_cast_into_type(klass, data)
+            return typed_data if typed_data
+          rescue # rescue all errors so we keep iterating even if the current item lookup raises
+          end
+        end
+
+        openapi_one_of.include?(:AnyType) ? data : nil
+      end
+
+      private
+
+      SchemaMismatchError = Class.new(StandardError)
+
+      # Note: 'File' is missing here because in the regular case we get the data _after_ a call to JSON.parse.
+      def find_and_cast_into_type(klass, data)
+        return if data.nil?
+
+        case klass.to_s
+        when 'Boolean'
+          return data if data.instance_of?(TrueClass) || data.instance_of?(FalseClass)
+        when 'Float'
+          return data if data.instance_of?(Float)
+        when 'Integer'
+          return data if data.instance_of?(Integer)
+        when 'Time'
+          return Time.parse(data)
+        when 'Date'
+          return Date.parse(data)
+        when 'String'
+          return data if data.instance_of?(String)
+        when 'Object' # "type: object"
+          return data if data.instance_of?(Hash)
+        when /\AArray<(?<sub_type>.+)>\z/ # "type: array"
+          if data.instance_of?(Array)
+            sub_type = Regexp.last_match[:sub_type]
+            return data.map { |item| find_and_cast_into_type(sub_type, item) }
+          end
+        when /\AHash<String, (?<sub_type>.+)>\z/ # "type: object" with "additionalProperties: { ... }"
+          if data.instance_of?(Hash) && data.keys.all? { |k| k.instance_of?(Symbol) || k.instance_of?(String) }
+            sub_type = Regexp.last_match[:sub_type]
+            return data.each_with_object({}) { |(k, v), hsh| hsh[k] = find_and_cast_into_type(sub_type, v) }
+          end
+        else # model
+          const = Petstore.const_get(klass)
+          if const
+            if const.respond_to?(:openapi_one_of) # nested oneOf model
+              model = const.build(data)
+              return model if model
+            else
+              # raise if data contains keys that are not known to the model
+              raise if const.respond_to?(:acceptable_attributes) && !(data.keys - const.acceptable_attributes).empty?
+              model = const.build_from_hash(data)
+              return model if model
+            end
+          end
+        end
+
+        raise # if no match by now, raise
+      rescue
+        raise SchemaMismatchError, "#{data} doesn't match the #{klass} type"
+      end
+    end
+  end
+
+end

samples/client/petstore/ruby-httpx/lib/petstore/models/mammal_anyof.rb

@@ -87,7 +87,7 @@ module Petstore
               return model if model
             else
               # raise if data contains keys that are not known to the model
-              raise unless (data.keys - const.acceptable_attributes).empty?
+              raise if const.respond_to?(:acceptable_attributes) && !(data.keys - const.acceptable_attributes).empty?
               model = const.build_from_hash(data)
               return model if model
             end

samples/client/petstore/ruby-httpx/lib/petstore/models/mammal_without_discriminator.rb

@@ -88,7 +88,7 @@ module Petstore
               return model if model
             else
               # raise if data contains keys that are not known to the model
-              raise unless (data.keys - const.acceptable_attributes).empty?
+              raise if const.respond_to?(:acceptable_attributes) && !(data.keys - const.acceptable_attributes).empty?
               model = const.build_from_hash(data)
               return model if model
             end

samples/client/petstore/ruby-httpx/spec/models/cow_spec.rb

@@ -0,0 +1,30 @@
+=begin
+#OpenAPI Petstore
+
+#This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\
+
+The version of the OpenAPI document: 1.0.0
+
+Generated by: https://openapi-generator.tech
+OpenAPI Generator version: 7.3.0-SNAPSHOT
+
+=end
+
+require 'spec_helper'
+require 'json'
+require 'date'
+
+# Unit tests for Petstore::Cow
+# Automatically generated by openapi-generator (https://openapi-generator.tech)
+# Please update as you see appropriate
+describe Petstore::Cow do
+  let(:instance) { Petstore::Cow.new }
+
+  describe 'test an instance of Cow' do
+    it 'should create an instance of Cow' do
+      # uncomment below to test the instance creation
+      #expect(instance).to be_instance_of(Petstore::Cow)
+    end
+  end
+
+end

samples/client/petstore/ruby-httpx/spec/models/mamal_with_enum_spec.rb

@@ -0,0 +1,32 @@
+=begin
+#OpenAPI Petstore
+
+#This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\
+
+The version of the OpenAPI document: 1.0.0
+
+Generated by: https://openapi-generator.tech
+OpenAPI Generator version: 7.3.0-SNAPSHOT
+
+=end
+
+require 'spec_helper'
+require 'json'
+require 'date'
+
+# Unit tests for Petstore::MamalWithEnum
+# Automatically generated by openapi-generator (https://openapi-generator.tech)
+# Please update as you see appropriate
+describe Petstore::MamalWithEnum do
+  describe '.openapi_one_of' do
+    it 'lists the items referenced in the oneOf array' do
+      expect(described_class.openapi_one_of).to_not be_empty
+    end
+  end
+
+  describe '.build' do
+    it 'returns the correct model' do
+      # assertion here. ref: https://rspec.info/features/3-12/rspec-expectations/built-in-matchers/
+    end
+  end
+end

samples/client/petstore/ruby/.openapi-generator/FILES

@@ -19,6 +19,7 @@ docs/Cat.md
 docs/Category.md
 docs/ClassModel.md
 docs/Client.md
+docs/Cow.md
 docs/DefaultApi.md
 docs/DeprecatedObject.md
 docs/Dog.md
@@ -36,6 +37,7 @@ docs/FormatTest.md
 docs/HasOnlyReadOnly.md
 docs/HealthCheckResult.md
 docs/List.md
+docs/MamalWithEnum.md
 docs/Mammal.md
 docs/MammalAnyof.md
 docs/MammalWithoutDiscriminator.md
@@ -91,6 +93,7 @@ lib/petstore/models/cat.rb
 lib/petstore/models/category.rb
 lib/petstore/models/class_model.rb
 lib/petstore/models/client.rb
+lib/petstore/models/cow.rb
 lib/petstore/models/deprecated_object.rb
 lib/petstore/models/dog.rb
 lib/petstore/models/enum_arrays.rb
@@ -105,6 +108,7 @@ lib/petstore/models/format_test.rb
 lib/petstore/models/has_only_read_only.rb
 lib/petstore/models/health_check_result.rb
 lib/petstore/models/list.rb
+lib/petstore/models/mamal_with_enum.rb
 lib/petstore/models/mammal.rb
 lib/petstore/models/mammal_anyof.rb
 lib/petstore/models/mammal_without_discriminator.rb
@@ -135,4 +139,6 @@ lib/petstore/models/whale.rb
 lib/petstore/models/zebra.rb
 lib/petstore/version.rb
 petstore.gemspec
+spec/models/cow_spec.rb
+spec/models/mamal_with_enum_spec.rb
 spec/spec_helper.rb

samples/client/petstore/ruby/README.md

@@ -136,6 +136,7 @@ Class | Method | HTTP request | Description
  - [Petstore::Category](docs/Category.md)
  - [Petstore::ClassModel](docs/ClassModel.md)
  - [Petstore::Client](docs/Client.md)
+ - [Petstore::Cow](docs/Cow.md)
  - [Petstore::DeprecatedObject](docs/DeprecatedObject.md)
  - [Petstore::Dog](docs/Dog.md)
  - [Petstore::EnumArrays](docs/EnumArrays.md)
@@ -150,6 +151,7 @@ Class | Method | HTTP request | Description
  - [Petstore::HasOnlyReadOnly](docs/HasOnlyReadOnly.md)
  - [Petstore::HealthCheckResult](docs/HealthCheckResult.md)
  - [Petstore::List](docs/List.md)
+ - [Petstore::MamalWithEnum](docs/MamalWithEnum.md)
  - [Petstore::Mammal](docs/Mammal.md)
  - [Petstore::MammalAnyof](docs/MammalAnyof.md)
  - [Petstore::MammalWithoutDiscriminator](docs/MammalWithoutDiscriminator.md)

samples/client/petstore/ruby/docs/Cow.md

@@ -0,0 +1,15 @@
+# Petstore::Cow
+
+## Properties
+
+| Name | Type | Description | Notes |
+| ---- | ---- | ----------- | ----- |
+
+## Example
+
+```ruby
+require 'petstore'
+
+instance = Petstore::Cow.new()
+```
+

samples/client/petstore/ruby/docs/MamalWithEnum.md

@@ -0,0 +1,47 @@
+# Petstore::MamalWithEnum
+
+## Class instance methods
+
+### `openapi_one_of`
+
+Returns the list of classes defined in oneOf.
+
+#### Example
+
+```ruby
+require 'petstore'
+
+Petstore::MamalWithEnum.openapi_one_of
+# =>
+# [
+#   :'Cow'
+# ]
+```
+
+### build
+
+Find the appropriate object from the `openapi_one_of` list and casts the data into it.
+
+#### Example
+
+```ruby
+require 'petstore'
+
+Petstore::MamalWithEnum.build(data)
+# => #<Cow:0x00007fdd4aab02a0>
+
+Petstore::MamalWithEnum.build(data_that_doesnt_match)
+# => nil
+```
+
+#### Parameters
+
+| Name | Type | Description |
+| ---- | ---- | ----------- |
+| **data** | **Mixed** | data to be matched against the list of oneOf items |
+
+#### Return type
+
+- `Cow`
+- `nil` (if no type matches)
+

samples/client/petstore/ruby/lib/petstore.rb

@@ -28,6 +28,7 @@ require 'petstore/models/capitalization'
 require 'petstore/models/category'
 require 'petstore/models/class_model'
 require 'petstore/models/client'
+require 'petstore/models/cow'
 require 'petstore/models/deprecated_object'
 require 'petstore/models/enum_arrays'
 require 'petstore/models/enum_class'
@@ -41,6 +42,7 @@ require 'petstore/models/format_test'
 require 'petstore/models/has_only_read_only'
 require 'petstore/models/health_check_result'
 require 'petstore/models/list'
+require 'petstore/models/mamal_with_enum'
 require 'petstore/models/mammal'
 require 'petstore/models/mammal_anyof'
 require 'petstore/models/mammal_without_discriminator'

samples/client/petstore/ruby/lib/petstore/models/cow.rb

@@ -0,0 +1,40 @@
+=begin
+#OpenAPI Petstore
+
+#This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\
+
+The version of the OpenAPI document: 1.0.0
+
+Generated by: https://openapi-generator.tech
+OpenAPI Generator version: 7.3.0-SNAPSHOT
+
+=end
+
+require 'date'
+require 'time'
+
+module Petstore
+  class Cow
+    BLACK_AND_WHITE_COW = "BlackAndWhiteCow".freeze
+    BROWN_COW = "BrownCow".freeze
+
+    def self.all_vars
+      @all_vars ||= [BLACK_AND_WHITE_COW, BROWN_COW].freeze
+    end
+
+    # Builds the enum from string
+    # @param [String] The enum value in the form of the string
+    # @return [String] The enum value
+    def self.build_from_hash(value)
+      new.build_from_hash(value)
+    end
+
+    # Builds the enum from string
+    # @param [String] The enum value in the form of the string
+    # @return [String] The enum value
+    def build_from_hash(value)
+      return value if Cow.all_vars.include?(value)
+      raise "Invalid ENUM value #{value} for class #Cow"
+    end
+  end
+end

samples/client/petstore/ruby/lib/petstore/models/mamal_with_enum.rb

@@ -0,0 +1,104 @@
+=begin
+#OpenAPI Petstore
+
+#This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\
+
+The version of the OpenAPI document: 1.0.0
+
+Generated by: https://openapi-generator.tech
+OpenAPI Generator version: 7.3.0-SNAPSHOT
+
+=end
+
+require 'date'
+require 'time'
+
+module Petstore
+  module MamalWithEnum
+    class << self
+      # List of class defined in oneOf (OpenAPI v3)
+      def openapi_one_of
+        [
+          :'Cow'
+        ]
+      end
+
+      # Builds the object
+      # @param [Mixed] Data to be matched against the list of oneOf items
+      # @return [Object] Returns the model or the data itself
+      def build(data)
+        # Go through the list of oneOf items and attempt to identify the appropriate one.
+        # Note:
+        # - We do not attempt to check whether exactly one item matches.
+        # - No advanced validation of types in some cases (e.g. "x: { type: string }" will happily match { x: 123 })
+        #   due to the way the deserialization is made in the base_object template (it just casts without verifying).
+        # - TODO: scalar values are de facto behaving as if they were nullable.
+        # - TODO: logging when debugging is set.
+        openapi_one_of.each do |klass|
+          begin
+            next if klass == :AnyType # "nullable: true"
+            typed_data = find_and_cast_into_type(klass, data)
+            return typed_data if typed_data
+          rescue # rescue all errors so we keep iterating even if the current item lookup raises
+          end
+        end
+
+        openapi_one_of.include?(:AnyType) ? data : nil
+      end
+
+      private
+
+      SchemaMismatchError = Class.new(StandardError)
+
+      # Note: 'File' is missing here because in the regular case we get the data _after_ a call to JSON.parse.
+      def find_and_cast_into_type(klass, data)
+        return if data.nil?
+
+        case klass.to_s
+        when 'Boolean'
+          return data if data.instance_of?(TrueClass) || data.instance_of?(FalseClass)
+        when 'Float'
+          return data if data.instance_of?(Float)
+        when 'Integer'
+          return data if data.instance_of?(Integer)
+        when 'Time'
+          return Time.parse(data)
+        when 'Date'
+          return Date.parse(data)
+        when 'String'
+          return data if data.instance_of?(String)
+        when 'Object' # "type: object"
+          return data if data.instance_of?(Hash)
+        when /\AArray<(?<sub_type>.+)>\z/ # "type: array"
+          if data.instance_of?(Array)
+            sub_type = Regexp.last_match[:sub_type]
+            return data.map { |item| find_and_cast_into_type(sub_type, item) }
+          end
+        when /\AHash<String, (?<sub_type>.+)>\z/ # "type: object" with "additionalProperties: { ... }"
+          if data.instance_of?(Hash) && data.keys.all? { |k| k.instance_of?(Symbol) || k.instance_of?(String) }
+            sub_type = Regexp.last_match[:sub_type]
+            return data.each_with_object({}) { |(k, v), hsh| hsh[k] = find_and_cast_into_type(sub_type, v) }
+          end
+        else # model
+          const = Petstore.const_get(klass)
+          if const
+            if const.respond_to?(:openapi_one_of) # nested oneOf model
+              model = const.build(data)
+              return model if model
+            else
+              # raise if data contains keys that are not known to the model
+              raise if const.respond_to?(:acceptable_attributes) && !(data.keys - const.acceptable_attributes).empty?
+              model = const.build_from_hash(data)
+              return model if model
+            end
+          end
+        end
+
+        raise # if no match by now, raise
+      rescue
+        raise SchemaMismatchError, "#{data} doesn't match the #{klass} type"
+      end
+    end
+  end
+
+end

samples/client/petstore/ruby/lib/petstore/models/mammal_anyof.rb

@@ -87,7 +87,7 @@ module Petstore
               return model if model
             else
               # raise if data contains keys that are not known to the model
-              raise unless (data.keys - const.acceptable_attributes).empty?
+              raise if const.respond_to?(:acceptable_attributes) && !(data.keys - const.acceptable_attributes).empty?
               model = const.build_from_hash(data)
               return model if model
             end

samples/client/petstore/ruby/lib/petstore/models/mammal_without_discriminator.rb

@@ -88,7 +88,7 @@ module Petstore
               return model if model
             else
               # raise if data contains keys that are not known to the model
-              raise unless (data.keys - const.acceptable_attributes).empty?
+              raise if const.respond_to?(:acceptable_attributes) && !(data.keys - const.acceptable_attributes).empty?
               model = const.build_from_hash(data)
               return model if model
             end

samples/client/petstore/ruby/spec/models/cow_spec.rb

@@ -0,0 +1,30 @@
+=begin
+#OpenAPI Petstore
+
+#This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\
+
+The version of the OpenAPI document: 1.0.0
+
+Generated by: https://openapi-generator.tech
+OpenAPI Generator version: 7.3.0-SNAPSHOT
+
+=end
+
+require 'spec_helper'
+require 'json'
+require 'date'
+
+# Unit tests for Petstore::Cow
+# Automatically generated by openapi-generator (https://openapi-generator.tech)
+# Please update as you see appropriate
+describe Petstore::Cow do
+  let(:instance) { Petstore::Cow.new }
+
+  describe 'test an instance of Cow' do
+    it 'should create an instance of Cow' do
+      # uncomment below to test the instance creation
+      #expect(instance).to be_instance_of(Petstore::Cow)
+    end
+  end
+
+end

samples/client/petstore/ruby/spec/models/mamal_with_enum_spec.rb

@@ -0,0 +1,36 @@
+=begin
+#OpenAPI Petstore
+
+#This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\
+
+The version of the OpenAPI document: 1.0.0
+
+Generated by: https://openapi-generator.tech
+OpenAPI Generator version: 7.3.0-SNAPSHOT
+
+=end
+
+require 'spec_helper'
+require 'json'
+require 'date'
+
+# Unit tests for Petstore::MamalWithEnum
+# Automatically generated by openapi-generator (https://openapi-generator.tech)
+# Please update as you see appropriate
+describe Petstore::MamalWithEnum do
+  describe '.openapi_one_of' do
+    it 'lists the items referenced in the oneOf array' do
+      expect(described_class.openapi_one_of).to_not be_empty
+    end
+  end
+
+  describe '.build' do
+    it 'returns the correct model' do
+      expect(described_class.build("BlackAndWhiteCow")).to eq(Petstore::Cow::BLACK_AND_WHITE_COW)
+    end
+
+    it 'returns nil for unknown model' do
+      expect(described_class.build({ classname: 'monkey', type: 'gorilla' })).to be_nil
+    end
+  end
+end